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BQ24250: BQ24250 - EN1, EN2 and Vdpm..

Marat G96
Prodigy 60 points
Part Number: BQ24250

For my project I try different charging chips, I have questions about the BQ24250 IC:

1) Do Vdpm values need to be set by resistors R1 and R2, or is this value set by bits B0-B2 in register #5?


2) Pins EN1 and EN2 - the levels on them do not affect the charging current, why? Because I configured the IC via the I2C bus?

3) Did I understand correctly that the BQ24250 cannot determine the type of charger and use the B4 bit (DPDM_EN) is not necessary?

  • 0
    TI__Guru*** 148825 points
    Hi Marta,

    Regarding 1, the default values are set by VDPM resistors (depending the EN1/EN2 settings) but you can change from those values using I2C registers.

    Regarding 2, EN1/EN2 set input current limit default values but those can be overwritten using the I2C registers.

    Regarding 3, the BQ24250 does not have D+/D- pins and so B4 is not functional.

    Regards,
    Jeff
  • 0 in reply to Jeff F
    Prodigy 60 points
    Jeff, thanks.
    This means that the parameters written to the registers of the chip take precedence over what is set by default by resistors and levels on the pins, right?
  • 0 in reply to Marat G96
    TI__Guru*** 148825 points
    Marat,

    Yes, that is correct. Keep in mind the watchdog timer needs to be periodically written to or disabled in order to prevent return to the default parameters.

    Regards,
    Jeff